水润滑螺旋阶梯腔艉轴承的振动特性

摘 要：为了解决瞬态振动实验成本高，周期长的问题，采用正交试验法，基于ANSYS模态和瞬态分析，提出了一种准确测量艉轴承共振时真实位移和应力的方法。首先，运用有限元模态分析对艉轴承低阶固有频率以及振型进行数值仿真；其次，将得到的固有频率间接耦合到艉轴承激励频率，使之达到共振频率；最后分析了这种状态下的动态接触对轴瓦的影响。结果表明：艉轴承结构参数对模态的影响因子排序为，螺旋角＞腔数＞腔长＞深浅腔比例；位移响应最大值出现在轴向封油面末端，接触应力响应最大值出现在沟槽和腔体周向封油面边缘处。

Study on The Vibration Characteristics of Water Lubricated Spiral Ladder Recesses Stern Bearing

Abstract: In order to solve the problem of high cost and long period of transient vibration experiments, an orthogonal test method was used. Based on the ANSYS modal analysis and transient analysis, a method to obtain the true values of the stress and displacement response of the Stern bearing was proposed. First, the finite element modal analysis is used to simulate the low-order natural frequency and vibration mode of the Stern bearing. Secondly, the natural frequency is indirectly coupled to the Stern bearing excitation frequency so that it reaches the resonance frequency. Finally, The impact of dynamic contact on the liner of bearing was analyzed. The results show that the influence factors of the bearing structure parameters on the modal state are: helix angle> cavity number> cavity length> ratio of depth to shallow cavity; The maximum displacement response occurs at the end of the axial seal face;The maximum contact stress response occurs at the edge of the groove and the circumferential sealing surface of the cavity;